Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel and dice the sweet potato into 1-inch cubes and slice the carrots into half-inch rounds.
Finely mince the garlic clove.
Place the chicken breast, diced sweet potatoes, and carrots in a large mixing bowl.
Drizzle with olive oil and sprinkle with dried rosemary, dried thyme, sea salt, black pepper, and minced garlic.
Toss everything together until the chicken and vegetables are evenly coated in the oil and herbs.
Spread the mixture in a single layer on the prepared sheet pan, ensuring the chicken has space around it.
Roast for 25 to 30 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender and lightly browned.
Let the chicken rest for 5 minutes before slicing and serving alongside the roasted root vegetables.